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Control Mechanism for Ink Jet Printing of Optical Character Recognition Fonts

IP.com Disclosure Number: IPCOM000084688D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Liebert, MJ: AUTHOR [+2]

Abstract

Ink jet printing may be arranged to print lines of various widths by varying the number of drops across the line. The print quality (or intensity) of character printing such as for optical character recognition (OCR) may thus be initially adjusted by an automatic procedure.

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Control Mechanism for Ink Jet Printing of Optical Character Recognition Fonts

Ink jet printing may be arranged to print lines of various widths by varying the number of drops across the line. The print quality (or intensity) of character printing such as for optical character recognition (OCR) may thus be initially adjusted by an automatic procedure.

Specifically, an initial OCR ink intensity value is loaded into a print quality control register and a series of vertical test bars are printed. The control register values are continually adjusted to cause the printing of increasing widths.

Optical sensors determine the stroke width and the printing continues until the upper value bound is detected. Then, bars of progressively lesser widths are printed and sensed until the lower value bound is detected. The intensity value midway between the bounds is then selected as the operating point and tested so that the printing may proceed.

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